linuxthreads_db/thread_db.h

   1 /* Copyright (C) 1999 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Library General Public License as
   6    published by the Free Software Foundation; either version 2 of the
   7    License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Library General Public License for more details.
  13
  14    You should have received a copy of the GNU Library General Public
  15    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  16    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17    Boston, MA 02111-1307, USA.  */
  18
  19 #ifndef _THREAD_DB_H
  20 #define _THREAD_DB_H    1
  21
  22 /* This is the debugger interface for the LinuxThreads library.  It is
  23    modelled closely after the interface with same names in Solaris with
  24    the goal to share the same code in the debugger.  */
  25 #include <pthread.h>
  26 #include <stdint.h>
  27 #include <sys/types.h>
  28 #include <sys/ucontext.h>
  29
  30
  31 /* Error codes of the library.  */
  32 typedef enum
  33 {
  34   TD_OK,        /* No error.  */
  35   TD_ERR,       /* No further specified error.  */
  36   TD_NOTHR,     /* No matching thread found.  */
  37   TD_NOSV,      /* No matching synchronization handle found.  */
  38   TD_NOLWP,     /* No matching light-weighted process found.  */
  39   TD_BADPH,     /* Invalid process handle.  */
  40   TD_BADTH,     /* Invalid thread handle.  */
  41   TD_BADSH,     /* Invalid synchronization handle.  */
  42   TD_BADTA,     /* Invalid thread agent.  */
  43   TD_BADKEY,    /* Invalid key.  */
  44   TD_NOMSG,     /* No event available.  */
  45   TD_NOFPREGS,  /* No floating-point register content available.  */
  46   TD_LIBTHREAD, /* Application not linked with thread library.  */
  47   TD_NOEVENT,   /* Requested event is not supported.  */
  48   TD_NOCAPAB,   /* Capability not available.  */
  49   TD_DBERR,     /* Internal debug library error.  */
  50   TD_NOAPLIC,   /* Operation is not applicable.  */
  51   TD_NOTSD,     /* No thread-specific data available.  */
  52   TD_MALLOC,    /* Out of memory.  */
  53   TD_PARTIALREG,/* Not entire register set was read or written.  */
  54   TD_NOXREGS    /* X register set not available for given thread.  */
  55 } td_err_e;
  56
  57
  58 /* Possible thread states.  TD_THR_ANY_STATE is a pseudo-state used to
  59    select threads regardless of state in td_ta_thr_iter().  */
  60 typedef enum
  61 {
  62   TD_THR_ANY_STATE,
  63   TD_THR_UNKNOWN,
  64   TD_THR_STOPPED,
  65   TD_THR_RUN,
  66   TD_THR_ACTIVE,
  67   TD_THR_ZOMBIE,
  68   TD_THR_SLEEP,
  69   TD_THR_STOPPED_ASLEEP
  70 } td_thr_state_e;
  71
  72 /* Thread type: user or system.  TD_THR_ANY_TYPE is a pseudo-type used
  73    to select threads regardless of type in td_ta_thr_iter().  */
  74 typedef enum
  75 {
  76   TD_THR_ANY_TYPE,
  77   TD_THR_USER,
  78   TD_THR_SYSTEM
  79 } td_thr_type_e;
  80
  81
  82 /* Types of the debugging library.  */
  83
  84 /* Addresses.  */
  85 typedef void *psaddr_t;
  86
  87 /* Handle for a process.  This type is opaque.  */
  88 typedef struct td_thragent td_thragent_t;
  89
  90 /* The actual thread handle type.  This is also opaque.  */
  91 typedef struct td_thrhandle
  92 {
  93   td_thragent_t *th_ta_p;
  94   psaddr_t th_unique;
  95 } td_thrhandle_t;
  96
  97
  98 /* Flags for `td_ta_thr_iter'.  */
  99 #define TD_THR_ANY_USER_FLAGS   0xffffffff
 100 #define TD_THR_LOWEST_PRIORITY  -20
 101 #define TD_SIGNO_MASK           NULL
 102
 103
 104 #define TD_EVENTSIZE    2
 105 #define BT_UISHIFT      5 /* log base 2 of BT_NBIPUI, to extract word index */
 106 #define BT_NBIPUI       (1 << BT_UISHIFT)       /* n bits per uint */
 107 #define BT_UIMASK       (BT_NBIPUI - 1)         /* to extract bit index */
 108
 109 /* Bitmask of enabled events. */
 110 typedef struct td_thr_events
 111 {
 112   uint32_t event_bits[TD_EVENTSIZE];
 113 } td_thr_events_t;
 114
 115 /* Event set manipulation macros. */
 116 #define __td_eventmask(n) \
 117   (UINT32_C (1) << (((n) - 1) & BT_UIMASK))
 118 #define __td_eventword(n) \
 119   ((UINT32_C ((n) - 1)) >> BT_UISHIFT)
 120
 121 #define td_event_emptyset(setp) \
 122   do {                                                                        \
 123     int __i;                                                                  \
 124     for (__i = TD_EVENTSIZE; __i > 0; --__i)                                  \
 125       (setp)->event_bits[__i - 1] = 0;                                        \
 126   } while (0)
 127
 128 #define td_event_fillset(setp) \
 129   do {                                                                        \
 130     int __i;                                                                  \
 131     for (__i = TD_EVENTSIZE; __i > 0; --__i)                                  \
 132       (setp)->event_bits[__i - 1] = UINT32_C (0xffffffff);                    \
 133   } while (0)
 134
 135 #define td_event_addset(setp, n) \
 136   (((setp)->event_bits[__td_eventword (n)]) |= __td_eventmask (n))
 137 #define td_event_delset(setp, n) \
 138   (((setp)->event_bits[__td_eventword (n)]) &= ~__td_eventmask (n))
 139 #define td_eventismember(setp, n) \
 140   (__td_eventmask (n) & ((setp)->event_bits[__td_eventword (n)]))
 141 #if TD_EVENTSIZE == 2
 142 # define td_eventisempty(setp) \
 143   (!((setp)->event_bits[0]) && !((setp)->event_bits[1]))
 144 #else
 145 # error "td_eventisempty must be changed to match TD_EVENTSIZE"
 146 #endif
 147
 148 /* Events reportable by the thread implementation.  */
 149 typedef enum
 150 {
 151   TD_ALL_EVENTS,                 /* Pseudo-event number.  */
 152   TD_EVENT_NONE = TD_ALL_EVENTS, /* Depends on context.  */
 153   TD_READY,                      /* Is executable now. */
 154   TD_SLEEP,                      /* Blocked in a synchronization obj.  */
 155   TD_SWITCHTO,                   /* Now assigned to a process.  */
 156   TD_SWITCHFROM,                 /* Not anymore assigned to a process.  */
 157   TD_LOCK_TRY,                   /* Trying to get an unavailable lock.  */
 158   TD_CATCHSIG,                   /* Signal posted to the thread.  */
 159   TD_IDLE,                       /* Process getting idle.  */
 160   TD_CREATE,                     /* New thread created.  */
 161   TD_DEATH,                      /* Thread terminated.  */
 162   TD_PREEMPT,                    /* Preempted.  */
 163   TD_PRI_INHERIT,                /* Inherited elevated priority.  */
 164   TD_REAP,                       /* Reaped.  */
 165   TD_CONCURRENCY,                /* Number of processes changing.  */
 166   TD_TIMEOUT,                    /* Conditional variable wait timed out.  */
 167   TD_MIN_EVENT_NUM = TD_READY,
 168   TD_MAX_EVENT_NUM = TD_TIMEOUT,
 169   TD_EVENTS_ENABLE = 31         /* Event reporting enabled.  */
 170 } td_event_e;
 171
 172 /* Values representing the different ways events are reported.  */
 173 typedef enum
 174 {
 175   NOTIFY_BPT,                   /* User must insert breakpoint at u.bptaddr. */
 176   NOTIFY_AUTOBPT,               /* Breakpoint at u.bptaddr is automatically
 177                                    inserted.  */
 178   NOTIFY_SYSCALL                /* System call u.syscallno will be invoked.  */
 179 } td_notify_e;
 180
 181 /* Description how event type is reported.  */
 182 typedef struct td_notify
 183 {
 184   td_notify_e type;             /* Way the event is reported.  */
 185   union
 186   {
 187     psaddr_t bptaddr;           /* Address of breakpoint.  */
 188     int syscallno;              /* Number of system call used.  */
 189   } u;
 190 } td_notify_t;
 191
 192 /* Structure used to report event.  */
 193 typedef struct td_event_msg
 194 {
 195   td_event_e event;             /* Event type being reported.  */
 196   const td_thrhandle_t *th_p;   /* Thread reporting the event.  */
 197   union
 198   {
 199 # if 0
 200     td_synchandle_t *sh;        /* Handle of synchronization object.  */
 201 #endif
 202     uintptr_t data;             /* Event specific data.  */
 203   } msg;
 204 } td_event_msg_t;
 205
 206
 207 /* Gathered statistics about the process.  */
 208 typedef struct td_ta_stats
 209 {
 210   int nthreads;                 /* Total number of threads in use.  */
 211   int r_concurrency;            /* Concurrency level requested by user.  */
 212   int nrunnable_num;            /* Average runnable threads, numerator.  */
 213   int nrunnable_den;            /* Average runnable threads, denominator.  */
 214   int a_concurrency_num;        /* Achieved concurrency level, numerator.  */
 215   int a_concurrency_den;        /* Achieved concurrency level, denominator.  */
 216   int nlwps_num;                /* Average number of processes in use,
 217                                    numerator.  */
 218   int nlwps_den;                /* Average number of processes in use,
 219                                    denominator.  */
 220   int nidle_num;                /* Average number of idling processes,
 221                                    numerator.  */
 222   int nidle_den;                /* Average number of idling processes,
 223                                    denominator.  */
 224 } td_ta_stats_t;
 225
 226
 227 /* Since Sun's library is based on Solaris threads we have to define a few
 228    types to map them to POSIX threads.  */
 229 typedef pthread_t thread_t;
 230 typedef pthread_key_t thread_key_t;
 231
 232 /* Linux has different names for the register set types.  */
 233 typedef gregset_t prgregset_t;
 234 typedef fpregset_t prfpregset_t;
 235
 236
 237 /* Callback for iteration over threads.  */
 238 typedef int td_thr_iter_f __P ((const td_thrhandle_t *, void *));
 239
 240 /* Callback for iteration over thread local data.  */
 241 typedef int td_key_iter_f __P ((thread_key_t, void (*) (void *), void *));
 242
 243
 244
 245 /* Forward declaration.  This has to be defined by the user.  */
 246 struct ps_prochandle;
 247
 248 /* We don't have any differences between processes and threads, therefore
 249    have only one PID type.  */
 250 typedef pid_t lwpid_t;
 251
 252
 253 /* Information about the thread.  */
 254 typedef struct td_thrinfo
 255 {
 256   td_thragent_t *ti_ta_p;               /* Process handle.  */
 257   unsigned int ti_user_flags;           /* Unused.  */
 258   thread_t ti_tid;                      /* Thread ID returned by
 259                                            pthread_create().  */
 260   char *ti_tls;                         /* Pointer to thread-local data.  */
 261   psaddr_t ti_startfunc;                /* Start function passed to
 262                                            pthread_create().  */
 263   psaddr_t ti_stkbase;                  /* Base of thread's stack.  */
 264   long int ti_stksize;                  /* Size of thread's stack.  */
 265   psaddr_t ti_ro_area;                  /* Unused.  */
 266   int ti_ro_size;                       /* Unused.  */
 267   td_thr_state_e ti_state;              /* Thread state.  */
 268   unsigned char ti_db_suspended;        /* Nonzero if suspended by debugger. */
 269   td_thr_type_e ti_type;                /* Type of the thread (system vs
 270                                            user thread).  */
 271   intptr_t ti_pc;                       /* Unused.  */
 272   intptr_t ti_sp;                       /* Unused.  */
 273   short int ti_flags;                   /* Unused.  */
 274   int ti_pri;                           /* Thread priority.  */
 275   lwpid_t ti_lid;                       /* Unused.  */
 276   sigset_t ti_sigmask;                  /* Signal mask.  */
 277   unsigned char ti_traceme;             /* Nonzero if event reporting
 278                                            enabled.  */
 279   unsigned char ti_preemptflag;         /* Unused.  */
 280   unsigned char ti_pirecflag;           /* Unused.  */
 281   sigset_t ti_pending;                  /* Set of pending signals.  */
 282   td_thr_events_t ti_events;            /* Set of enabled events.  */
 283 } td_thrinfo_t;
 284
 285
 286
 287 /* Prototypes for exported library functions.  */
 288
 289 /* Initialize the thread debug support library.  */
 290 extern td_err_e td_init (void);
 291
 292 /* Historical relict.  Should not be used anymore.  */
 293 extern td_err_e td_log (void);
 294
 295 /* Generate new thread debug library handle for process PS.  */
 296 extern td_err_e td_ta_new (struct ps_prochandle *__ps, td_thragent_t **__ta);
 297
 298 /* Free resources allocated for TA.  */
 299 extern td_err_e td_ta_delete (td_thragent_t *__ta);
 300
 301 /* Get number of currently running threads in process associated with TA.  */
 302 extern td_err_e td_ta_get_nthreads (const td_thragent_t *__ta, int *__np);
 303
 304 /* Return process handle passed in `td_ta_new' for process associated with
 305    TA.  */
 306 extern td_err_e td_ta_get_ph (const td_thragent_t *__ta,
 307                               struct ps_prochandle **__ph);
 308
 309 /* Map thread library handle PT to thread debug library handle for process
 310    associated with TA and store result in *TH.  */
 311 extern td_err_e td_ta_map_id2thr (const td_thragent_t *__ta, pthread_t __pt,
 312                                   td_thrhandle_t *__th);
 313
 314 /* Map process ID LWPID to thread debug library handle for process
 315    associated with TA and store result in *TH.  */
 316 extern td_err_e td_ta_map_lwp2thr (const td_thragent_t *__ta, lwpid_t __lwpid,
 317                                    td_thrhandle_t *__th);
 318
 319
 320 /* Call for each thread in a process associated with TA the callback function
 321    CALLBACK.  */
 322 extern td_err_e td_ta_thr_iter (const td_thragent_t *__ta,
 323                                 td_thr_iter_f *__callback, void *__cbdata_p,
 324                                 td_thr_state_e __state, int __ti_pri,
 325                                 sigset_t *__ti_sigmask_p,
 326                                 unsigned int __ti_user_flags);
 327
 328 /* Call for each defined thread local data entry the callback function KI.  */
 329 extern td_err_e td_ta_tsd_iter (const td_thragent_t *__ta, td_key_iter_f *__ki,
 330                                 void *__p);
 331
 332
 333 /* Get event address for EVENT.  */
 334 extern td_err_e td_ta_event_addr (const td_thragent_t *__ta,
 335                                   td_event_e __event, td_notify_t *__ptr);
 336
 337
 338 /* Set suggested concurrency level for process associated with TA.  */
 339 extern td_err_e td_ta_setconcurrency (const td_thragent_t *__ta, int __level);
 340
 341
 342 /* Enable collecting statistics for process associated with TA.  */
 343 extern td_err_e td_ta_enable_stats (const td_thragent_t *__ta, int __enable);
 344
 345 /* Reset statistics.  */
 346 extern td_err_e td_ta_reset_stats (const td_thragent_t *__ta);
 347
 348 /* Retrieve statistics from process associated with TA.  */
 349 extern td_err_e td_ta_get_stats (const td_thragent_t *__ta,
 350                                  td_ta_stats_t *__statsp);
 351
 352
 353 /* Validate that TH is a thread handle.  */
 354 extern td_err_e td_thr_validate (const td_thrhandle_t *__th);
 355
 356 /* Return information about thread TH.  */
 357 extern td_err_e td_thr_get_info (const td_thrhandle_t *__th,
 358                                  td_thrinfo_t *__infop);
 359
 360 /* Retrieve floating-point register contents of process running thread TH.  */
 361 extern td_err_e td_thr_getfpregs (const td_thrhandle_t *__th,
 362                                   prfpregset_t *__regset);
 363
 364 /* Retrieve general register contents of process running thread TH.  */
 365 extern td_err_e td_thr_getgregs (const td_thrhandle_t *__th,
 366                                  prgregset_t __gregs);
 367
 368 /* Retrieve extended register contents of process running thread TH.  */
 369 extern td_err_e td_thr_getxregs (const td_thrhandle_t *__th, void *__xregs);
 370
 371 /* Get size of extended register set of process running thread TH.  */
 372 extern td_err_e td_thr_getxregsize (const td_thrhandle_t *__th, int *__sizep);
 373
 374 /* Set floating-point register contents of process running thread TH.  */
 375 extern td_err_e td_thr_setfpregs (const td_thrhandle_t *__th,
 376                                   const prfpregset_t *__fpregs);
 377
 378 /* Set general register contents of process running thread TH.  */
 379 extern td_err_e td_thr_setgregs (const td_thrhandle_t *__th,
 380                                  prgregset_t __gregs);
 381
 382 /* Set extended register contents of process running thread TH.  */
 383 extern td_err_e td_thr_setxregs (const td_thrhandle_t *__th,
 384                                  const void *__addr);
 385
 386
 387 /* Enable reporting for EVENT for thread TH.  */
 388 extern td_err_e td_thr_event_enable (const td_thrhandle_t *__th, int __event);
 389
 390 /* Enable EVENT for thread TH.  */
 391 extern td_err_e td_thr_set_event (const td_thrhandle_t *__th,
 392                                   td_thr_events_t *__event);
 393
 394 /* Disable EVENT for thread TH.  */
 395 extern td_err_e td_thr_clear_event (const td_thrhandle_t *__th,
 396                                     td_thr_events_t *__event);
 397
 398 /* Get event message for thread TH.  */
 399 extern td_err_e td_thr_event_getmsg (const td_thrhandle_t *__th,
 400                                      td_event_msg_t *__msg);
 401
 402
 403 /* Set priority of thread TH.  */
 404 extern td_err_e td_thr_setprio (const td_thrhandle_t *__th, int __prio);
 405
 406
 407 /* Set pending signals for thread TH.  */
 408 extern td_err_e td_thr_setsigpending (const td_thrhandle_t *__th,
 409                                       unsigned char __n, const sigset_t *__ss);
 410
 411 /* Set signal mask for thread TH.  */
 412 extern td_err_e td_thr_sigsetmask (const td_thrhandle_t *__th,
 413                                    const sigset_t *__ss);
 414
 415
 416 /* Return thread local data associated with key TK in thread TH.  */
 417 extern td_err_e td_thr_tsd (const td_thrhandle_t *__th,
 418                             const thread_key_t __tk, void **__data);
 419
 420
 421 /* Suspend execution of thread TH.  */
 422 extern td_err_e td_thr_dbsuspend (const td_thrhandle_t *__th);
 423
 424 /* Resume execution of thread TH.  */
 425 extern td_err_e td_thr_dbresume (const td_thrhandle_t *__th);
 426
 427 #endif  /* thread_db.h */